Jordanian pilot Muath al-Kasasbeh in a video released by Islamic State insurgents.Credit:Reuters

"The sentence of death pending on ... Iraqi Sajida al-Rishawi will be carried out at dawn," a security official said on Tuesday, speaking on condition of anonymity.

Rishawi was condemned to death for her participation in deadly attacks in Amman in 2005.

Heartbroken: A man comforts the wife of Jordanian pilot Muath al-Kasasbeh on Wednesday before the video surfaced.Credit:Raad Adayleh

IS had offered to spare the life of the Jordanian pilot if she were released.

The pilot's fate has gripped Jordan and provoked rare protests against King Abdullah over the government's handling of the case.

Muath al-Kasasbeh, who was captured by Islamic State.Credit:AFP

US President Barack Obama said the video, if real, would redouble the determination of a US-led alliance to degrade and destroy Islamic State. He said it would be another sign of the "viciousness and barbarity" of the militants.

In the video, the burnt man wore orange clothes similar to those worn by other foreign Islamic State captives who have been killed since the US-led coalition started bombing the militants in July.

In the video, Lieutenant Kasasbeh is interviewed, describing the mission he was due to carry out before his jet crashed. The video also showed footage of the aftermath of air strikes, with people trying to remove civilians from debris.

A man resembling Lieutenant Kasasbeh is shown inside the cage with his clothes dampened, apparently with flammable liquid, and one of the masked fighters holds a torch, setting alight a line of fuel that leads into the cage.

The man is set ablaze and kneels to the ground.

Fighters then pour debris, including broken masonry, over the cage, which a bulldozer then flattens, with the body still inside.

The video showed a desert setting similar to previous videos of killings.

Islamic State has released several videos showing the beheadings of Western hostages.

The beheading of Japanese hostage Kenji Goto, a veteran war reporter, was shown in a video released by IS on Saturday.